Separate lifecycle callbacks for activity + process state

[fractalwrench]

Goal

Separates the lifecycle callbacks for the activity + process state. Currently these are implemented together in the same class (ActivityService) but these are distinct responsibilities so we should separate them.

I have refactored the implementation so that ProcessStateService is responsible for tracking the process foreground/background state, and that ActivityTracker is responsible for tracking activity lifecycle callbacks.

Testing

Updated existing test coverage.

[codecov]

Codecov Report

Merging #69 (d364e76) into master (5168910) will decrease coverage by 0.01%.
Report is 2 commits behind head on master.
The diff coverage is 81.81%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #69      +/-   ##
==========================================
- Coverage   76.06%   76.05%   -0.01%     
==========================================
  Files         309      311       +2     
  Lines       10046    10074      +28     
  Branches     1447     1450       +3     
==========================================
+ Hits         7641     7662      +21     
- Misses       1817     1824       +7     
  Partials      588      588              

Files	Coverage Δ
...mbrace/android/embracesdk/anr/EmbraceAnrService.kt	90.16% <ø> (ø)
...racesdk/capture/crumbs/EmbraceBreadcrumbService.kt	74.41% <ø> (ø)
...k/capture/crumbs/PushNotificationCaptureService.kt	78.00% <ø> (ø)
...racesdk/capture/metadata/EmbraceMetadataService.kt	84.61% <100.00%> (ø)
...k/capture/powersave/EmbracePowerSaveModeService.kt	71.73% <100.00%> (ø)
...roid/embracesdk/capture/user/EmbraceUserService.kt	70.17% <ø> (ø)
.../android/embracesdk/config/EmbraceConfigService.kt	85.44% <ø> (ø)
...ce/android/embracesdk/event/EmbraceEventService.kt	86.36% <ø> (ø)
...oid/embracesdk/injection/EssentialServiceModule.kt	95.65% <100.00%> (+0.06%)	⬆️
...oid/embracesdk/injection/SdkObservabilityModule.kt	100.00% <100.00%> (ø)
... and 15 more

[bidetofevil]

Who calls this? If we don't need this I'd rather not have it

[fractalwrench]

EmbraceAutomaticVerification calls it (and other services) unfortunately

[bidetofevil]

Ack....

[bidetofevil]

Looks good to me